<template>
	<div>
		<router-link tag="div" to="/" class="header-abs"
		v-show="showAbs">
			<div class="iconfont header-abs-back">&#xe624;</div>
		</router-link>
		<div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
			<router-link to='/'>
				<div class="iconfont header-fixed-back">&#xe624;</div>
			</router-link>
			景点详情
		</div>
	</div>
</template>

<script>
export default {
	name: 'DetailHeader',
	data () {
		return {
			showAbs: true,
			opacityStyle: {
				opacity: 0
			}
		}
	},
	methods: {
		handleScroll () {
			const top = document.documentElement.scrollTop
			if (top > 60) {
				let opacity = top / 140
				opacity = opacity > 1 ? 1 : opacity
				this.opacityStyle = { opacity }
				this.showAbs = false
			}else {
				this.showAbs = true
			}
		}
	},
	activated () {
		window.addEventListener('scroll',this.handleScroll)
	},
	deactivated () {
		window.removeEventListener('scroll',this.handleScroll)
	}
}
</script>

<style lang="stylus" scoped>
@import '~styles/varibles.styl'
.header-abs
	position: absolute
	left: .2rem
	top: .2rem
	width: .8rem
	height: .8rem
	border-radius: .4rem
	line-height: .8rem
	text-align:center
	background: rgba(0,0,0,.8)
	.header-abs-back
		color: #fff
		font-size: .4rem
.header-fixed
		position: fixed
		top: 0
		left: 0
		right: 0
		height: $headerHeight
		line-height: $headerHeight
		text-align: center
		color: #fff
		background: $bgColor
		font-size: .32rem
		.header-fixed-back
			top: 0
			left: 0
			position: absolute
			width: .64rem
			text-align: center
			font-size: .4rem
			color: #fff
	
	
</style>